201915866850 has 24 divisors (see below), whose sum is σ = 500751350160. Its totient is φ = 53844231120.

The previous prime is 201915866843. The next prime is 201915866851. The reversal of 201915866850 is 58668519102.

It is a junction number, because it is equal to n+sod(n) for n = 201915866793 and 201915866802.

It is not an unprimeable number, because it can be changed into a prime (201915866851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 673052740 + ... + 673053039.

It is an arithmetic number, because the mean of its divisors is an integer number (20864639590).

Almost surely, 2^201915866850 is an apocalyptic number.

201915866850 is an abundant number, since it is smaller than the sum of its proper divisors (298835483310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201915866850 is a wasteful number, since it uses less digits than its factorization.

201915866850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346105794 (or 1346105789 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 51.

The spelling of 201915866850 in words is "two hundred one billion, nine hundred fifteen million, eight hundred sixty-six thousand, eight hundred fifty".